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authorLibravatar Linus Torvalds <torvalds@linux-foundation.org>2010-10-28 11:28:04 -0700
committerLibravatar Junio C Hamano <gitster@pobox.com>2011-03-11 14:42:54 -0800
commitdce96489162b05ae3463741f7f0365ff56f0de36 (patch)
treeb342bc64b96a6553e58c0a29a1225c0d7832e9b4 /compat/vcbuild/include/sys/select.h
parentGit 1.7.4 (diff)
downloadtgif-dce96489162b05ae3463741f7f0365ff56f0de36.tar.xz
Make the default abbrev length configurable
The default of 7 comes from fairly early in git development, when seven hex digits was a lot (it covers about 250+ million hash values). Back then I thought that 65k revisions was a lot (it was what we were about to hit in BK), and each revision tends to be about 5-10 new objects or so, so a million objects was a big number. These days, the kernel isn't even the largest git project, and even the kernel has about 220k revisions (_much_ bigger than the BK tree ever was) and we are approaching two million objects. At that point, seven hex digits is still unique for a lot of them, but when we're talking about just two orders of magnitude difference between number of objects and the hash size, there _will_ be collisions in truncated hash values. It's no longer even close to unrealistic - it happens all the time. We should both increase the default abbrev that was unrealistically small, _and_ add a way for people to set their own default per-project in the git config file. This is the first step to first make it configurable; the default of 7 is not raised yet. Signed-off-by: Junio C Hamano <gitster@pobox.com>
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